Electrical machine.



Patented July 22, I902.

T. B. HATCH.

ELECTRICAL MACHINE.

(Application filed Nov. 15, 1901.)

. (No Model.)

2 Sheets-Sheet I.

No. 705,238. Patented July 22, I902.

T. B. HATCH.

ELECTRICAL MACHINE.

(Application filed. Nov. 15, 1901.)

2 Sheets8heet 2.

(No Model.)

fiZ067z%/7 UNITED States PATENT FFICE;

TRACY BARBOUR HATCH, OF MENOMONIE, \VISCONSIN, ASSIGNOR TO SUB- MERGED ELECTRIC MOTOR COMPANY, OF MENOHONIE, \VISCONSIN, A CORPORATION OF VISCONSIN.

ELECTRECAL MACl-HNE.

SPECIFICATION forming part of Letters Patent No. 705,238, dated July 22, 1902.

Application filed November 15, 1901. Serial No- 82,377. (No model.)

To all whom it may concern: F F are power-circuit wires, and G G are Be it known that I, TRACY BARBOUR the wires leading to the storage battery to be HATCH, a citizen of the United States, resid charged and comprising the battery-circuit.

ing at Menomonie, in the county of Dunn and As shown in the diagram Fig. 3, the power- 5 State of Wisconsin, have invented a new'and circuit wire passes directly to the field-winduseful Improvement in Electrical Machines, ing A,thence to the field-winding A ,and out. of which the following is a Specification. The motor resistance-winding D communi- My invention relates to an improvement cates through a wireD with one of the brushes in the construction of controlling resistance aat the commutator O. The other brush a 1o mechanismsas appliedtodynamo-electric maat the commutator C communicates directly chines; and my object is to provide the 0011- with the return-wire F. trolling resistance mechanism as apart of the On the heads II II of the field structure structure of the machine to render the maare ears 0 c, supporting a rod I parallel with chine self contained in the sense that the the face I) of the field structure. The rod I is 15 whole forms a single compact structure. insulated from the ears 0 c and is connected In the accompanying drawings I show my by a wire I with the power-circuit wire F. invention applied to a motor-generator con- On the rod I is a sliding sleeve 1 carrying a structed for the purpose of reducing or conpair of spring contact strips or fingers I vertinga high-pressure current ofsmall quain which press upon the resistance-winding D.

20 tity to a low-pressure current of large quan- In starting the motor the contact-fingers I tity to adapt it more especially for charging may be slid along the rod I to produce the storage batteries from commercial pressures. desired resistance and then moved back to Nhile myimprovementsare especially desirthe position desired to maintain the resistable upon motor-generators,they are not limauce wanted or cut it out entirely. Also on 25 ited thereto, but may be advantageously apthe heads II of the field structure are cars (l plied to electric machines of the general class d, supporting a rod K, to extend parallel with 7 5 above defined. the face I) of the field. The rod K is insu- Referring to the drawings, Figure 1 is a lated from the ears (Z d and communicates perspective view of a motor-generator conwith the battery-circuit wire G. The gener- 30 structed in accordance with my improveator-regulating resistance-winding E is conmen-ts; Fig. 2, a longitudinal section of the nected bya wire E with one of the brushes (1 same; Fig. 3, a diagrammatic representation at the commutator C, while the other brush of the electric circuitinamotor-generator cona is connected to the return end of the batstructed with a shunt-field as herein shown, tery-circuit wire G. On the rod K is a slid- 35 and Fig. 4 a perspective view of a motoring sleeve K, carrying spring contact fingers generator with my improvements in the form or strips K whichbear against the winding I prefer to provide more particularly in the E. The contacts K maybe moved along the case of a comparatively large device. wire E to bring one or more turns into the A is the field structure; A A the fieldcircuit,and thereby regulate the resistance in 40 magnet windings; B, a double-wound armathe battery-circuit.

ture; C C, the commutators, and a CL the In the construction shown in Fig. 4 I subcommutator-brushes. The field structure is stitute segmental plates L 011 opposite sides provided with a cylindrical outer face I), carof the field structure, fastened at their opporying a motor resistance-winding D, consistsite ends to the heads H. The plate on one 45 ing of a number "of turns of comparatively side has contacts Z communicating with the small wire for high pressure, and ageneratorprogressive turns of the motor resistanceregulating resistance-winding E, consisting winding, While the plate on the opposite side of several turns of comparatively large wire has similar contacts communicating with the i for low pressure. progressive turns of the generator resistance winding. On the heads H are arms or brackets H, supporting pivotal switch-bars M, having handles M. The switch-bar M, movable along the motor resistance-contacts, is connected with the shunt-wire I,While the switchbar on the opposite side is connected with the battery-circuit G.

Although I have shown my improvements in connection with a circuit using a shuntfield, it may be employed upon an electric machine having a series fieldthat is to say, wherein the field-Winding is in series with the motor-winding. My improvements may also be applied to an electric machine havin g a stationary armature and revolving field. It is necessary, of course, that the resistancewindings shall be upon the stationary or reactive member of the device, and this may be either the field or the armature, and the movable contacts or switches must be mounted upon a support either fixed to or in fixed relation to the stationary or reacting member to form parts of a single compact structure. It will be obvious, therefore, that while I prefer to construct my improvements as shown and described they may be variously modified without departing from the spirit of my invention as d efined by the claims.

WVhat I claim as new, and desire to secure by Letters Patent, is

1. In a motor-generator, a motor resistance Winding for high pressure Wound about and exposed upon the frame of the machine, and a regulating-resistance low-pressure winding for the generator exposed upon the machine, and switch devices on the frame of the machine connected respeotively with the motor and generator circuits and movable along the said resistance-windings, substantially as and for the purpose set forth.

2. In a motor generator, constructed as shown and described, a resistance-wire for the motor and a regulating resistance-wire for the generator, both wound about the field structure, and switch devices mounted upon the frame of the machine and movable along said resistance-windings, substantially as and for the purpose set forth.

TRACY BARBOUR HATCH.

In presence of JOHN HoPWooD, WILLIAM H. ALLEN. 

